[77970] in North American Network Operators' Group
Re: Vonage complains about VoIP-blocking
daemon@ATHENA.MIT.EDU (Rob Thomas)
Tue Feb 15 16:28:38 2005
Date: Tue, 15 Feb 2005 15:28:12 -0600 (CST)
From: Rob Thomas <robt@cymru.com>
To: Daniel Golding <dgolding@burtongroup.com>
Cc: NANOG <nanog@merit.edu>
In-Reply-To: <BE37D139.7E56%dgolding@burtongroup.com>
Errors-To: owner-nanog-outgoing@merit.edu
Hi, Dan.
] Why block TFTP at your borders? To keep people from loading new versions of
] IOS on your routers? ;)
Funny you should mention that. :) We have seen miscreants do exactly
that. They will upgrade or downgrade routers to support a feature set
of their choosing.
A lot of malware uses TFTP to update itself as well.
Please note that I am NOT advocating the blocking of TFTP.
Thanks,
Rob.
--
Rob Thomas
http://www.cymru.com
Shaving with Occam's razor since 1999.
